Handle KeyError in _get_admin_auth_token.
Handle KeyError in _get_admin_auth_token.

Updates the _get_admin_auth_token so that it more gracefully
handles KeyError's.
Also adds a conn.close to the _get_admin_auth_token method.

Fixes LP Bug #942247.

Change-Id: I2826f1b02bc7fd46c02ab3d15d88f76b9a8457f0

dims/keystone,mahak/keystone,cloudbau/keystone,rajalokan/keystone,promptworks/keystone,jumpstarter-io/keystone,ging/keystone,cernops/keystone,idjaw/keystone,MaheshIBM/keystone,citrix-openstack-build/keystone,jamielennox/keystone,rickerc/keystone_audit,ilay09/keystone,kwss/keystone,ging/keystone,UTSA-ICS/keystone-kerberos,dsiddharth/access-keys,jumpstarter-io/keystone,openstack/keystone,ntt-sic/keystone,cbrucks/Federated_Keystone,sileht/deb-openstack-keystone,cbrucks/keystone_ldap,kwss/keystone,townbull/keystone-dtrust,rajalokan/keystone,dstanek/keystone,dstanek/keystone,derekchiang/keystone,savi-dev/keystone,MaheshIBM/keystone,roopali8/keystone,cloudbau/keystone,jumpstarter-io/keystone,sileht/deb-openstack-keystone,takeshineshiro/keystone,ajayaa/keystone,rodrigods/keystone,reeshupatel/demo,kwss/keystone,himanshu-setia/keystone,vivekdhayaal/keystone,JioCloud/keystone,dims/keystone,openstack/keystone,cbrucks/Federated_Keystone,cbrucks/keystone_ldap,savi-dev/keystone,citrix-openstack-build/keystone,klmitch/keystone,savi-dev/keystone,jamielennox/keystone,cbrucks/Federated_Keystone,dsiddharth/access-keys,rodrigods/keystone,mahak/keystone,townbull/keystone-dtrust,promptworks/keystone,ntt-sic/keystone,sileht/deb-openstack-keystone,maestro-hybrid-cloud/keystone,dsiddharth/access-keys,roopali8/keystone,dstanek/keystone,blueboxgroup/keystone,cloudbau/keystone,vivekdhayaal/keystone,rushiagr/keystone,jonnary/keystone,vivekdhayaal/keystone,idjaw/keystone,rajalokan/keystone,rushiagr/keystone,derekchiang/keystone,citrix-openstack-build/keystone,townbull/keystone-dtrust,rickerc/keystone_audit,ntt-sic/keystone,cbrucks/keystone_ldap,derekchiang/keystone,nuxeh/keystone,ilay09/keystone,openstack/keystone,jonnary/keystone,mahak/keystone,takeshineshiro/keystone,JioCloud/keystone,nuxeh/keystone,klmitch/keystone,cernops/keystone,blueboxgroup/keystone,reeshupatel/demo,ajayaa/keystone,UTSA-ICS/keystone-kerberos,ilay09/keystone,rickerc/keystone_audit,promptworks/keystone,nuxeh/keystone,rushiagr/keystone,maestro-hybrid-cloud/keystone,himanshu-setia/keystone,reeshupatel/demo